Study on Biodiversity of the Gaoligong Mountains——Ⅱ Study on Niche of the Main Tree Species in Schima khasiana & Lithocarpus hance Forest

Based on investigation of 6 band plots sampled in the Schima khasiana & Lithocarpus hance forest in the Gaoligong Nature Reserve, the niche characteristics of 10 main tree species consisting of the forest were analyzed. The results showed that the Shannon-Wiener and Levins's niche breadths of Schima khasiana, Lithocarpus hancei, Lindera fruticosa, Salix magnifica and Myrsine semiserrata tree species were 0.772, 0.761, 0.741, 0.659, 0.632 and 0.971, 0.934, 0.843, 0.708, 0.658 respectively. The descending order of the niche breadth was to some extent in accordance with the importance value sequence of the populations. 88.89% of the L_ih niche overlapping values and 75.56% of the L_hi niche overlapping values in the community were over 0.08. There was an evident resource-sharing potential among the main tree species, but there was no positive correlation between the values of niche overlapping and niche breadth of the tree species. The niche overlapping values were smaller among tree species that all had larger niche breadth values, while the niche overlapping values were larger among tree species if there was much difference in niche breadth values. There were greater niche overlapping values among tree species that all had smaller niche breadth values. It was found out that the community studied was in the cause of restoration.